Incandescent electric lamp.



c. A. HARRISON.

. INCANDESCENT ELECT RIC LAMP.

APPLICATION FILED MAR. 24. 19:4.

l. ,,%%?,956; I PiatntedNov. 27, 1917..

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CLARA ALICE HARRISON,- OF LONDON, ENGLAND.

INGANDESCENT ELECTRIC LAMF.

Specification of Letters Patent.

Application filed March 24, 1914. Serial No. 826,919.

To all whom it mag concern."

Be it known that LCLARA ALICE :HARRI soN, a citizen bf the United Kingdom of.

Great Britain and Ireland, and resident of 14 Dickenson road, Crouch End, London, England, have invented certain new and useful Improvements in or Relating to Incandescent Electric Lamps, of which the following is a specification, such as will enable others 1 skilled in the art to which it appertainsto make and use the same.

'This invention relates to the renewing or refilling of electric incandescent lamps with wire or like filaments.v I The essential feature of this invention is the use of spring clips which are independ- 'ent of the leading-in wires, but can be inserted into 'a lamp to grip and hold such wires while they also grip the filament or are connected thereto in any other convenient manner. As a modification connecting pieces may be used which are attached to the leading-in wires by a ring, hook or the like, while one or both of them grip the fila ment with a spring action. The clips are inserted into the lamp through a hole which ismost conveniently made in the pip and may be enlarged if desired and after the operation is finished the hole is closed in an convenient manner.

' order to more fully explain my said invention- I, will describe the same with reference to the accompanying drawings, in

, which Figure 1 shows a lamp having a hole, at its bottom, through which the filament has been removed; Fig 2 shows end and side views-of a spring clip; Fig. 3 shows spring clips secured to leading-in wires, and a filament-end secured to one such clip; Fig. 4: shows the new filament in place and the aforesaid opening closed; Figs. 5 and 6 are views of a form of tool useful in fitting the sprin -clips and the filament-ends in place.

Re erring to Figs. 1 and 2, an old lamp may have the usual pip removed, and the resulting hole, at a, suificiently enlarged to permit the pieces of a broken filament to fall therethrough.

Spring clips may 'then be inserted, through the hole mentioned, and secured to the. usual leading-in wires 0'. Suitable spring clips are shown in Fig. 2, and each may consist of a coiled wire helix', 6, having the adjacent convolutions close together..

These clips are each intended to be separately inserted into the lamp, by a suitable tool, and theadjacent convolutions sprung apart to grip therebetween the leadingin wires, 0. One end of the new filament is then passed into the lamp, and fitted be tween another pair of convolutions of the helix. .It will be seen, therefore, that each clip is detachable from both the leading-in wire 2 and the filament-end, and while it holds the filament out of contact with the wire will form part of the circuit of the lamp when put into use.

It must be understood that the filament may be attached to the clips before they are inserted into the lamp or after insertion, or

.to one clip before insertion and to the other after.

Fig. 4 shows a lamp like that in Fig. 3 in which the filament d has been passed over the hooks e and attached by both its ends to the said clips. Any suitable tools may be employed to manipulate the clips andlthe filament; for example, the clips may be opened by inserting a blunt tool between the coils so as to make an opening sufiiciently wide to receive the leading in wires or the. filament or both, as the case may be, after which. the tool is removed and the spring clip closes upon the wire or filament, or both. Fig. 5 shows a tool comprising a handle f in which a tube g is fixed. This tube has a side opening it and has within it a slidable wire '5 one end of which projects through the side opening and the other from the end ofithe tube.

In using this tool the end :5 is put between the coil of the wire clip to hold it open and facilitate the insertion of the leading in wire or the filament, or both. When the wire or filament is in the clip the end i is withdrawn into the tube by pulling the wire at its end projecting through the opening it thus withdrawing the end i from the clip which tl en closes on the leading-in wire or filament.

As an example of the moclus operand'i, assuming clip with one end of the filament is introduced into the bulb by the tool and is connected to a leading-in wire; the tool is then removed and any suitable tool employed to place the filament over the hooks 6 after which the other leadingfin wire and the other end of the filament are connected together by another clip. f

If a supporting wire is without a hook it may be suitably bent to make a hook or equivalent to facilitate attaching the filament and for. this purpose a tool such as shown in Fig. 6 may be used. This tool re-t' sembles that shown in Fig. 5 but the projectingend of the wire is hook-shaped, as

ters Patent is leading-in wire;' a detachable spring connecting means ceinprising .a closely-coiled helix supported by the wire and gripping'ly engaging the same between adjacent convo- 1. In an incandescent electriclainp, a-

lutions; and a filament'gripped hetweefi.

other pair of convolutions of said'he l '2. In an incandescent electric lanil a leading-inqwire; a filament; and a 's' ring means, detachable from. both wire an fila- .20

ineiit grippingly engaging both and hold ing the filament out of contact" with the leading-in wire. J

- In witness whereof I have hereunto set my hand inpresence of two witnesses.

1 CLARA ALIOE'HABRISON Witnesses;

BRUNO Ka'rz, v I-IENnY FAi-imnorrmn. 

